I own a similar Airline, but I think my dial is different.
Did you pull the rectifier when you variaced it?...I've variaced a set that had shorted lytics and a plate-cathode rectifier (6X5) short. Results were as bad or worse than you describe...Until I unplugged the rectifier then all went back to normal, and it was able to work with just a new set of caps and rectifier.
It may not be as bad as you think.
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